Salim ibn 'Abdullah reported from his father that 'Umar used to say to his sons, "Separate in the morning and do not meet together in the same house. I fear that you might split up or that some evil may take place between you."  

عَنْ أَبِيهِ كَانَ عُمَرُ يَقُولُ لِبَنِيهِ إِذَا أَصْبَحْتُمْ فَتَبَدَّدُوا وَلاَ تَجْتَمِعُوا فِي دَارٍ وَاحِدَةٍ فَإِنِّي أَخَافُ عَلَيْكُمْ أَنْ تَقَاطَعُوا أَوْ يَكُونَ بَيْنَكُمْ شَرٌّ